HEV e-drives with HV boost ratio and wide DC bus voltage range

Abstract

A system includes a bus, and a variable voltage converter (VVC) having a switch in series with a capacitor, and an inductor in parallel with the capacitor and switch, and configured such that operation of the switch in boost mode over a duty cycle range from 0 to less than 0.5 results in a corresponding voltage output to the bus from 0 to a maximum of the VVC.

What is claimed is: 
     
       1. A system comprising:
 a bus; 
 a variable voltage converter (VVC)
 including a switch in series with a capacitor, and an inductor in parallel with the capacitor and switch, and 
 configured such that operation of the switch in boost mode over a duty cycle range from 0 to less than 0.5 results in a corresponding voltage output to the bus from 0 to a maximum of the VVC; and 
 a battery connected to power the VVC, wherein the VVC further includes another inductor connected between a terminal of the battery and the switch. 
 
 
     
     
       2. The system of  claim 1 , wherein the VVC includes another switch in series with the switch and the boost mode includes controlling the switches in a complimentary fashion. 
     
     
       3. The system of  claim 1  further comprising an inverter connected to receive voltage output to the bus and to generate phase voltage approaching one-half of the voltage output to the bus such that a modulation index of the inverter approaches 1. 
     
     
       4. The system of  claim 1 , wherein the voltage output includes values less than voltage of the battery. 
     
     
       5. The system of  claim 1  further comprising an inverter connected to receive voltage output to the bus and to generate phase current output in a range independent of current output of the battery. 
     
     
       6. A system comprising:
 a battery; 
 an inverter; and 
 a variable voltage converter (VVC) connected between the battery and inverter, the VVC including a pair of switches, a capacitor in series with one of the switches, and an inductor in parallel with the capacitor and the one of the switches, and configured such that operation of the switches in boost mode over a duty cycle range from 0 to less than 0.5 results in a corresponding voltage output to the inverter in a range from 0 to a maximum of the VVC, wherein the inverter is configured to generate phase voltage approaching one-half of the voltage output to the inverter such that a modulation index of the inverter approaches 1. 
 
     
     
       7. The system of  claim 6 , wherein the boost mode includes controlling the switches in a complimentary fashion. 
     
     
       8. The system of  claim 6 , wherein the inverter is further configured to generate phase current output in a range independent of current output of the battery. 
     
     
       9. A system comprising:
 a bus; 
 a variable voltage converter (VVC)
 including a pair of switches, a capacitor in series with one of the switches, and an inductor in parallel with the capacitor and the one of the switches, and 
 configured such that operation of the switches in boost mode over a duty cycle range from 0 to less than 0.5 results in a corresponding voltage output to the bus from battery voltage to a maximum of the VVC; 
 
 an inverter connected to receive voltage output to the bus and to generate phase voltage to power an electric machine; and 
 a battery connected to power the VVC such that the phase voltage generated by the inverter approaches voltage of the battery, wherein the inverter is further configured to generate phase current output independent of current output of the battery such that a power factor of the inverter approaches 1. 
 
     
     
       10. The system of  claim 9 , wherein the boost mode includes controlling the switches in a complimentary fashion.